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Finite Element Modeling of Geothermal Source of Heat Pump in Long-Term Operation

Author

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  • Elżbieta Hałaj

    (AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, 30-059 Krakow, Poland)

  • Leszek Pająk

    (AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, 30-059 Krakow, Poland)

  • Bartosz Papiernik

    (AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, 30-059 Krakow, Poland)

Abstract

Model simulation allows to present the time-varying temperature distribution of the ground source for heat pumps. A system of 25 double U-shape borehole heat exchangers (BHEs) in long-term operation and three scenarios were created. In these scenarios, the difference between balanced and non-balanced energy load was considered as well as the influence of the hydrogeological factors on the temperature of the ground source. The aim of the study was to compare different thermal regimes of BHEs operation and examine the influence of small-scale and short-time thermal energy storage on ground source thermal balance. To present the performance of the system according to geological and hydrogeological factors, a Feflow ® software (MIKE Powered by DHI Software) was used. The temperature for the scenarios was visualized after 10 and 30 years of the system’s operation. In this paper, a case is presented in which waste thermal energy from space cooling applications during summer months was used to upgrade thermal performance of the ground (geothermal) source of a heat pump. The study shows differences in the temperature in the ground around different Borehole Heat Exchangers. The cold plume from the not-balanced energy scenario is the most developed and might influence the future installations in the vicinity. Moreover, seasonal storage can partially overcome the negative influence of the travel of a cold plume. The most exposed to freezing were BHEs located in the core of the cold plumes. Moreover, the influence of the groundwater flow on the thermal recovery of the several BHEs is visible. The proper energy load of the geothermal source heat pump installation is crucial and it can benefit from small-scale storage. After 30 years of operation, the minimum average temperature at 50 m depth in the system with waste heat from space cooling was 2.1 °C higher than in the system without storage and 1.6 °C higher than in the layered model in which storage was not applied.

Suggested Citation

  • Elżbieta Hałaj & Leszek Pająk & Bartosz Papiernik, 2020. "Finite Element Modeling of Geothermal Source of Heat Pump in Long-Term Operation," Energies, MDPI, vol. 13(6), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1341-:d:332350
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    References listed on IDEAS

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    Cited by:

    1. Aleksandra Szulc-Wrońska & Barbara Tomaszewska, 2020. "Low Enthalpy Geothermal Resources for Local Sustainable Development: A Case Study in Poland," Energies, MDPI, vol. 13(19), pages 1-20, September.
    2. Yujiao Li & Peng Liu & Wei Wang & Xianmin Ke & Yiwen Jiao & Yitian Liu & Haotian Liang, 2023. "Optimizing the Layout of a Ground Source Heat Pump System with a Groundwater–Thermal Coupling Model," Energies, MDPI, vol. 16(19), pages 1-18, September.
    3. Joanna Piotrowska-Woroniak, 2021. "Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)," Energies, MDPI, vol. 14(16), pages 1-32, August.
    4. Simone Mancin & Marco Noro, 2020. "Reversible Heat Pump Coupled with Ground Ice Storage for Annual Air Conditioning: An Energy Analysis," Energies, MDPI, vol. 13(23), pages 1-16, November.
    5. Joanna Piotrowska-Woroniak, 2021. "Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests," Energies, MDPI, vol. 14(9), pages 1-21, April.

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